When military professionals employ psychological models in appropriate ways, they may find perspectives that enable new action and points of view. As people are always changing, it is necessary to have fresh ways to understand ourselves and others. The Five-Factor Model and the Enneagram system show positive trends in scientific measuring and credibility yet are rarely used in the military. The focus herein extracts practical applications of these models for the military professional. Psychological models provide a framework to increase self-awareness, improve one's understanding of others, guide how one interacts with others, and illuminate the military activities that come most natural to the professional. Ultimately, the Five Factor Model is best suited to increase self-awareness by illuminating the military professional's natural disposition across five broad categories including openness, conscientiousness, extroversion, agreeableness, and neuroticism. The Enneagram's narrative provides a coherent image of nine different typologies and how they each tend to behave, think, and feel across various levels of performance. As archetypes, there is no one person who fits any of these categories precisely. However, these theories can serve as valuable guides for the most challenging aspect of the military profession: daily interaction in the complex world of people. Contents: Introduction * Chapter 1: Selection and Background of Psychological Models * Chapter 2: Self-Awareness and the Five-Factor Model * Chapter 3: Understanding Others and the Enneagram System * Chapter 4: Psychological Models as a Guide to Interacting with Others * Chapter 5: Psychological Models and Military Activities * Conclusion This monograph's methodology analyzes two specific psychological frameworks including the Five Factor Model (FFM) and the Enneagram system. It considers the realistic and practical applications of psychological models for military professionals. Applications that provide neither too little, leaving the professional without the means to turn psychological ideas into meaningful action, nor too much, attempting to predict a person's career precisely. The following chapter briefly discusses selection criteria and the background of each framework. Subsequent chapters analyze different applications of the selected psychological models to determine ways they may help military professionals. These include the use of psychological models as a means towards self-awareness, as a tool to improve one's understanding of others, and as a framework to guide how one interacts with others. A subsequent chapter uses psychological models to illuminate the military activities that may or may not come naturally for a particular personality type. Finally, the conclusion summarizes the main points and includes the advantages and gaps inherent in each framework.